Fix a link in the docs (#2977)

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# Rationale for this change
MKDocs has been complaining about an invalid link, but they were buried
in the logs. I'll work to figure out how to make these more visible in
the future.

## Are these changes tested?
MKDocs shouldn't show the issue in the logs anymore.

## Are there any user-facing changes?

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Author: rambleraptor

mkdocs/docs/configuration.md

@@ -81,7 +81,7 @@ Iceberg tables support table properties to configure table behavior.
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 !!! note "Fast append"
-    Unlike Java implementation, PyIceberg default to the [fast append](api.md#write-support) and thus `commit.manifest-merge.enabled` is set to `False` by default.
+    Unlike Java implementation, PyIceberg default to the [fast append](api.md#write-to-a-table) and thus `commit.manifest-merge.enabled` is set to `False` by default.
 
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